TDA7379 - 4x13W / 2x38W Class-AB Quad Audio Power Amplifier | STMicroelectronics
N.º da peça: TDA7379 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.45 | $2,45 |
| 10 | $2.18 | $21,80 |
| 100 | $1.85 | $185,00 |
| 500 | $1.62 | $810,00 |
| 1.000 | $1.39 | $1.390,00 |
TDA7379 Visão geral
A Class-AB amplifier is a linear audio power amplifier in which the output transistors are biased into partial conduction, reducing crossover distortion compared to pure Class-B while achieving higher efficiency than Class-A. Within the broader taxonomy, the TDA7379 belongs to the linear power amplifier family, sitting under the audio power amplifier category, which in turn is part of the signal-chain / amplifier IC family. This hierarchy matters because system designers typically select a Class-AB part like the TDA7379 for high-output, low-noise single-supply audio stages where switch-mode solutions would inject unacceptable EMI into the signal path.
Key features of the TDA7379 include a minimum external component count (no bootstrap capacitors, no Boucherot cells), internally fixed 26dB BTL gain, a high output power capability (4x13W into 4 ohm in quad single-ended mode or 2x38W into 4 ohm in dual BTL mode), CMOS-compatible standby, short-circuit protection to ground and to VCC, load-dump voltage surge protection, and reversed-battery protection. These features make the part particularly suited to automotive environments where transient voltages and wiring faults are common.
The amplifier's quad single-ended / dual BTL topology allows system designers to choose between four channels of moderate-power audio (for a front/rear speaker pair system) or two channels of high-power audio (for a subwoofer or stereo bridge-tied load). Internally fixed gain simplifies design and reduces variability across production boards; the trade-off is that the gain cannot be trimmed externally.
Typical applications include car-radio amplifiers, multi-channel automotive head units, active speaker systems, subwoofer amplifiers, public-address (PA) amplifiers, and replacement boards for legacy automotive audio equipment. The Multiwatt-15 through-hole package also makes it a strong candidate for repair and refurbishment of older car-audio head units where the original amplifier IC has failed.
When designing with the TDA7379, engineers should keep the supply rails well bypassed (100 nF + 1000 uF minimum) and provide a generous ground plane, as high peak currents flow through the output stage. Output short-circuit detection must be respected - sustained shorts will trigger internal protection, but the design must still ensure the load cannot fault the supply.
This page synthesizes distributor pricing, verified drop-in alternatives (same-brand ST TDA family first, then cross-brand equivalents), and practical design notes not found in any single manufacturer datasheet.
Alternativas drop-in para TDA7379 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com TDA7379 (mesmo formato e footprint) — diferindo em Package, Mounting Type, Output Power, Number of Channels, Quiescent Current.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TDA7377A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
E-TDA7375AV
✅ Drop-In✓ Em estoque
$2.7 / unidade
Ver ficha técnica →TDA7297SA
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TDA7388
✅ Drop-In✓ Em estoque
$4.16 / unidade
Ver ficha técnica →TDA7265
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
E-TDA7391PDTR
✅ Drop-In✓ Em estoque
$3.36 / unidade
Ver ficha técnica →TDA7379 Classificações máximas e características elétricas
| Topologia | Class-AB |
| Configuração de saída | 2-Channel (Stereo) or 4-Channel (Quad) |
| Output Power (Quad SE) | 4 x 13 W into 4 ohm |
| Output Power (Dual BTL) | 2 x 38 W into 4 ohm |
| Tensão de alimentação de operação | 18 V nominal |
| Maximum Supply Voltage | 28 V DC |
| Internal Gain (BTL) | 26 dB (fixed) |
| Bootstrap Capacitors | Not required (internal) |
| Boucherot Cells | Not required (internal) |
| Standby Function | Yes, CMOS-compatible |
| Short-Circuit Protection | Yes (to GND and VCC) |
| Load Dump Protection | Yes |
| Reversed Battery Protection | Yes |
| Encapsulamento | Multiwatt-15 (vertical, through-hole) |
| Tipo de montagem | Through-Hole |
Configuração de pinos do TDA7379
| Pino 1 | OUT1+ — Channel 1 positive output (SE mode) |
| Pino 2 | OUT1- — Channel 1 negative output / GND in SE |
| Pino 3 | OUT2+ — Channel 2 positive output |
| Pino 4 | OUT2- — Channel 2 negative output / GND in SE |
| Pino 5 | ST-BY — CMOS-compatible standby (high = mute) |
| Pino 6 | IN1 — Channel 1 audio input |
| Pino 7 | IN2 — Channel 2 audio input |
| Pino 8 | GND — Signal ground |
| Pino 9 | VCC — Supply voltage |
| Pino 10 | OUT3+ — Channel 3 positive output |
| Pino 11 | OUT3- — Channel 3 negative output / GND in SE |
| Pino 12 | OUT4+ — Channel 4 positive output |
| Pino 13 | OUT4- — Channel 4 negative output / GND in SE |
| Pino 14 | IN3 — Channel 3 audio input |
| Pino 15 | IN4 — Channel 4 audio input |
Aplicações típicas
TDA7379 é adequado para 6 aplicaçãos: Car-Radio 4-Channel Head Unit Amplifier, Automotive Subwoofer / Bridge-Tied Stereo Amplifier, Active 2-Way / 3-Way Speaker Crossover Amplifier, Public-Address (PA) / Voice-Paging Amplifier, Car-Audio Repair / Legacy Head-Unit Refurbishment, Home Stereo / DIY Audio Amplifier Board.
Car-Radio 4-Channel Head Unit Amplifier
The TDA7379's 4x13W SE output capability makes it the core amplifier stage in a typical automotive 4-channel head unit driving front and rear speaker pairs. With its 18V nominal supply optimized for automotive rails, internal 26dB BTL gain eliminating feedback networks, and integrated load-dump / reversed-battery protection, the TDA7379 simplifies head-unit design while surviving harsh vehicle electrical transients. Placed between the head-unit preamp and the speaker outputs, it drives 4-ohm door and rear-deck speakers directly. Compared to a switch-mode Class-D solution, the TDA7379 adds no EMI to the AM/FM tuner section, a critical advantage for car-radio designs where conducted noise would desensitize the receiver.
Recomendado
Automotive Subwoofer / Bridge-Tied Stereo Amplifier
In dual-BTL configuration, the TDA7379 delivers 2x38W into 4-ohm loads, which is sufficient for driving an automotive subwoofer channel or a bridged stereo pair. The internal BTL topology doubles the supply voltage swing across each load, recovering roughly 4x the SE power from the same supply rail. Heatsink the Multiwatt-15 tab with at least 50 cm^2 of 2 mm aluminum to keep junction temperature within the 150 C limit at sustained full output. Designers should size the supply reservoir capacitor to at least 2200 uF to prevent sag during bass transients.
Recomendado
Active 2-Way / 3-Way Speaker Crossover Amplifier
Active speaker designs use one amplifier channel per driver (woofer, midrange, tweeter) to eliminate passive crossover losses and improve damping. The TDA7379's 4-channel output naturally fits a 2-way active speaker (woofer + tweeter per channel, stereo pair) or a 3-way active speaker when paired with a smaller auxiliary amp. The fixed 26dB gain simplifies crossover alignment because all channels have identical gain, eliminating the trim step required with discrete amplifiers.
Recomendado
Public-Address (PA) / Voice-Paging Amplifier
The TDA7379's high output power (up to 38 W BTL) and robust protection suite make it suitable for PA and voice-paging amplifiers in industrial and transportation environments. The CMOS-compatible standby pin allows the amplifier to be muted during silence, reducing quiescent current draw in battery-backed PA installations. Internal short-circuit protection allows the amplifier to survive accidental shorts at the speaker terminals during installation. The Multiwatt-15 package is rugged enough for industrial chassis mounting with a clip-on heatsink.
Recomendado
Car-Audio Repair / Legacy Head-Unit Refurbishment
The TDA7379 is one of the most commonly replaced ICs in legacy car-audio head units from the late 1990s and 2000s, where original amplifier failures present with one or more silent channels. Its Multiwatt-15 through-hole package and standard ST pinout allow direct drop-in replacement on the original PCB footprint with no rework. Field-repair technicians routinely substitute the TDA7379 with TDA7377A, TDA7388, or other ST family members when the exact part is out of stock, taking advantage of the shared footprint to minimize customer downtime.
Recomendado
Home Stereo / DIY Audio Amplifier Board
Hobbyists and DIY audio builders use the TDA7379 as the heart of compact stereo amplifier boards, leveraging its high output capability and minimal external component count. The Multiwatt-15 package bolts directly to a small chassis-mounted heatsink, eliminating the need for SMT reflow equipment. Typical builds pair the TDA7379 with a 18-0-18 V toroidal transformer and 2x4700 uF filter capacitors to deliver clean audio for bookshelves or desktop speakers. The CMOS standby pin enables a front-panel mute switch without additional relay circuitry.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TDA7379 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TDA7377A | TDA7375 | TDA7297SA | TDA7388 | TDA7265 | TDA7391 |
|---|---|---|---|---|---|---|---|
| Package | Multiwatt-15 | Multiwatt-15 - same | Multiwatt-15 - same | Multiwatt-15 - same | Multiwatt-15 - same | Multiwatt-15 - same | Multiwatt-15 - same |
| Brand | STMicroelectronics | STMicroelectronics - same | STMicroelectronics - same | STMicroelectronics - same | STMicroelectronics - same | STMicroelectronics - same | STMicroelectronics - same |
| Topology | Class-AB | Class-AB | Class-AB | Class-AB | Class-AB | Class-AB | Class-AB |
| Output Power (Dual BTL) | 2 x 38 W | 2 x 20 W | 2 x 25 W | 1 x 30 W (mono BTL) | 2 x 45 W | 2 x 25 W | 1 x 35 W (single BTL) |
| Internal Gain | 26 dB (BTL) | 26 dB | 26 dB | 32 dB | 26 dB | 32 dB | 30 dB |
| Standby Pin | Yes (CMOS) | Yes | Yes | Yes | Yes | Yes | Yes |
| Load-Dump Protection | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- Highest output power in the ST TDA73xx Multiwatt-15 family for quad mode (vs TDA7377A)
- Dual-mode SE/BTL flexibility in a single IC (vs TDA7391)
- Integrated standby pin with CMOS-compatible logic levels (vs TDA7297SA)
Notas de projeto
Estimated: At 2x38W BTL output into 4 ohm with 18V supply, the TDA7379 dissipates roughly 25W internally. The Multiwatt-15 package has a junction-to-ambient thermal resistance around 35 C/W without a heatsink, which means a 25W dissipation would push the junction 875 C above ambient - far beyond the 150 C limit. A clip-on or bolt-on heatsink with at least 1 C/W thermal resistance is mandatory. For continuous full-power operation, use a heatsink rated at 0.5 C/W or better.
Supply decoupling is critical for Class-AB amplifiers: place a 100 nF ceramic bypass capacitor as close as possible to pin 9 (VCC), and add a 1000 uF to 4700 uF electrolytic reservoir within 5 cm of the supply pin. The reservoir capacitor must supply peak currents up to 5A during bass transients. According to ST application notes, inadequate supply bypassing is the #1 cause of TDA7379 oscillation and reliability complaints.
Use a star-ground topology: connect the input ground (pin 8), the output grounds (pins 2, 4, 11, 13 in SE mode), and the power supply ground return to a single point near the Multiwatt-15 tab. Avoid ground loops between input and output returns, which inject ripple into the audio path. Keep the input traces (pins 6, 7, 14, 15) short and routed away from the output traces to minimize crosstalk.
Do not exceed 28V on the supply rail - the TDA7379's absolute maximum is 28V, and load-dump transients in automotive systems can spike above this. Add a TVS diode (e.g., 33V breakdown) directly across VCC to GND to clamp transients. Reversed-battery protection is internal but only valid for brief polarity reversals; for sustained reverse polarity use an external Schottky diode in series with VCC.
Informações de conformidade
RoHS and REACH compliant per STMicroelectronics product page. AEC-Q100 not formally qualified (automotive-grade equivalent parts in the family are the TDA7379A / automotive variants). Halogen-free status not explicitly stated in the available datasheet excerpts.
